Lock-nut.



W. C. PETERS.

LOOK NUT. v APPLICATION FILED 33.27, 1911.

Patented June 27, 1911.

INVENTOR Z7 %M A'FT WITNESSES! WALTER CLAY reruns, or ToorINa LoN/noN. ENGLAND.

LOCK-NUT.

' Specification of Letters Patent.

Patented June 27, 1911.

Application filed February 27, 1911. Serial No. 611,034.

1'0 all whom itmay conccm:

Be it known that I WALTER CLAY PETERS,

subjectof the King. of Great Britain, re

siding at 132 Franciscan road, Tooting, in

the county of London, England, have in-' Vented new and useful Improvements in Lock-Nuts, of which the following is a specification.

This invention relates to improvements in the-manufacture of that type of lock-nut in which an undercut circular recess is formed 1n one end of one of the nuts to constitute a socketand a circular projection is pro"- property is concerned, acts only in the same.

yidedon the other, of such proportions that manner as a pair of separable lock-nuts, when they are so rotated relatively to each other as to tend to force the. faces toward one another and the only merit in the inter-' connection is their inseparability.

Now according to the present invention ldish the annular surface which forms the bottom of the socket whereby it slopes downward toward' the axis .of the screw-b0lt.

Moreover instead of the meeting surfaces of the nuts being parallel plane surfaces, one

a, slightly coned top a for the wall.

or both may be coned to such a degreethat on locking the nuts they come into contactfirst around the border of the socket-recess.

vided to fitspanners. Fig, 2 is an outside elevation as viewed in a direction at right angles to Fig. 1. Fig. 3 is a longitudinal section showing the componentsof the twinnut assembled preparatory to union, and. i

Fig. 4 is a longitudinal section of a modification.

In these drawings, a is the socket-formed nut having at, the base of the socket a surface a? .which slopes downward toward the axis of the bolt, an overhangingwall a i rl ld exterior of the wall is made cylindrical and the spigot.

'face of the wall of the spigot.

" redundant material which does not conduce to increase of strength, thus promoting the yieldability of the wall to a crushing force.

The spigot nut 6, before being'su-bjected to the distorting force. requisite to enable it to fill the socket, is made longer than the depth of the socket, the exterior'diameter of the spigot is'as large as will permt it to enter the socket,-the interior diameter is gradually contracted toward the extremity of the spigot, as indicated by b in 'Fig. 3,

and the end 72 is so shaped that when the two nuts are assembled, the outer border of the extremity .of the-spigot rests on the slopmg base a of the socket as shown in Fig. '3.

The distortion is effected by the combined operation of longitudinal crushing and radial expansion by forcing a drift through the interior, after which, with the marks (1 6 in line with one, another, a continuous screw-thread is formed in the interior of the twin-nut, the resulting product being as shown in F lgs. 1 and 2 1n WlllCl]. a narrow interval 1s left between the surface a of the socket-nut and the corresponding surface Z2 of the spigot-nut which bears thereon in the lockedcondition of the nuts, this interval converging toward the axis of the bolt with the object of promoting the contraction of the internal diameter of" the socket under the locking strain.

The effect of such a construction is as follows :After:screwing the twin nuts on the 'bolt and =then rotating them relatively to one another in a direction to tend to make them approach each other along the thread of the bolt, the'extremity of the spigot will come into pressure contact with the shelving bottom of the socketand the coping of the wall of the'socket into pressure contact with the base of the spigot, resulting in a longitudinal shortening. of the double wall and a corresponding thickening thereof, accompanied by a convergence of the foot of The elastic; yielding of the double wall will cause the threaded interior of the spigot to engage itself more deeply with the screw-threads of the bolt and fill up theinterposed 'slackness spaces. This action will be accompanied by pressure on the border of the socket and cause the overhanging wall thereof to still further overhangand tightly embracethe exterior sur- By such means a locking action will be called into existence which is supplementary to that above described lock-nut to an complete the inclosure. of the axle bearingwhich occurs in the locking of two ordinaryj separable nuts. The character of the supplementary locking action is such that the greater the axial pressure applied to the base of the inside nut, the more intense will the clasping action become so that, even with most' intense vibration and under, great strain, there will be no slackening of the hold fast. A further effect of the longitudinal shortening of the double wall, the consequent approach of the two-nuts and the clasp of the diverging outer surface of of a wheel and prevent the entrance of dust and the escape of oil. In this construction the socket nut 0 is formed with a flange which may, but not necessarily does make a liquid-tight joint with the hub of the wheel, and the partner nut (Z is formed with a solid inclosingend (7 i The joint between a and (I being liqul d-tlght, the construction performs the function of the ordinary capnut and possesses the added advantage that it is impossible for it to work loose.

l. In 'a twin lock-nut, a nut having an undercut recess with a shelving bottom, a second nut and a' spigot on'said second nut fitting said recess.

2. In a twin lock-nut, a nut having anundercut recess with a shelving bottom and a conlcal end surface surrounding said re cess, a second nut and aspigot on. said second' nut fitting said recess.

In a twnrlock-nut, a nuthavlng an undercut recess with a shelving bottom and a cylindrical exterior around said recess,a

second nut and a spigot on said second nut fitting said recess.

4. In atwln lock-nut, a nuthavmg an undercut recess with a shelving bottom, 'a

conical end surface surrounding said recess and a cylindrical exterior around said recess,

a second nut and-a spigot on said second nut fitting said recess. I 5. In a twin lock-nut, a nut having a undercut recess with a shelving bottom, a. flange on said nut at the end remote from "said recess, a second nu-t having a solid end and a spigot on said second nut "fitting said recess. I testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. I

-. WALTER CLAY PETERS.

Witnesse'si FREDERICK WILLIAM LANE. .H. D.'J nn :so.\ 

